Literally 麻油雞 (ma you ji) means "sesame oil chicken". The base ingredients in this traditional soup are sesame oil, ginger, rice wine and chicken. Some cookers add also ginseng and other Chinese medicines. There is a long tradition of making this soup with string noodles to eat it on birthdays; as that variety of noodles symbolizes longevity.
One of the most popular places is Jin-Jia-A-Tu Sesame Oil Chicken Stew in Linsen North Road (Zhong Shan District).